1. a troublemaker (usually a small and cheeky person)
2. someone who goes out of their way to annoy people in a humorous way

Originates from two great ancient runts 'Raphaelues Noethesus' (Queen Runt) and 'Doronellius Portnoilithus' (Junior Vice President Runt). The two caused havoc wherever they could unleashed all sorts of Runtness.